JP2008238995A - Vehicle body frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To divide a frame structure having a suspension support part into a small number of relatively compact frame components, and to reduce frame manufacturing man-hours, in a vehicle body frame structure of a vehicle having a pair of right and left wheels. <P>SOLUTION: In the vehicle body frame structure in which a front suspension supporting part 41A of a front frame assembly 41 comprises a pair of right and left cushion upper end supporting parts 45, a pair of right and left upper arm supporting parts 46a, 46b and lower arm supporting parts 47a, 47b, the front frame assembly 41 has a mainly vertically two-divided structure consisting of an upper front frame 42 having the right and left cushion upper end supporting parts 45, the right and left upper arm supporting parts 46a, 46b and the lower arm supporting parts 47a, 47b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle body frame structure having a pair of left and right wheels.

Conventionally, the vehicle body frame structure includes a frame structure having suspension support portions (left and right cushion upper end support portions and left and right upper and lower arm support portions) for suspension of left and right wheels, and the frame structure body includes a plurality of cast parts ( Some of the main components are frame components (see, for example, Patent Document 1). In this method, the frame structure is roughly divided into left and right cast parts, and the left and right separate cast parts are joined together by welding.
Japanese Patent Laid-Open No. 08-197967

By the way, in the above-mentioned conventional configuration, the frame structure is divided into a left and right divided structure, and the number of frame components is reduced and the size of the components is reduced. However, the upper arm support portion and the lower arm in the suspension support portion are reduced. Since the support portions are provided long in the front and rear directions, and the cushion upper end support portion is provided so as to be spaced upward from the upper arm support portion and the lower arm support portion, the frame structure can be divided into left and right parts even if the frame component is divided into two parts. There is a problem that miniaturization is difficult. In addition, when welding the left and right separate frame components, it is necessary to perform a welding operation while controlling the accuracy between the left and right suspension support portions, which increases the number of frame manufacturing steps.
Accordingly, the present invention provides a vehicle body frame structure having a pair of left and right wheels, wherein the frame structure having the suspension support portion is divided into a small number of relatively small frame components and the number of frame manufacturing steps is reduced. Objective.

  As a means for solving the above problems, the invention described in claim 1 is a vehicle body frame structure of a vehicle (saddle-ride type vehicle 1) provided with a pair of left and right wheels (for example, the front wheel 2 of the embodiment), wherein the left and right wheels A frame structure (for example, the front frame assembly 41 of the embodiment) having a suspension support portion for suspension (for example, the front suspension support portion 41A of the embodiment) is provided, and the suspension support portion is a pair of left and right cushion upper end support portions (for example, the embodiment). In a vehicle body frame structure comprising an example cushion upper end support portion 45) and a pair of left and right upper arm support portions (for example, upper arm support portions 46a, 46b of the embodiment) and a lower arm support portion (for example, lower arm support portions 47a, 47b of the embodiment), The upper frame in which the frame structure has the left and right cushion upper end support portions A component (for example, the upper front frame 42 of the embodiment) and a lower frame component (for example, the lower front frame 43 of the embodiment) having the left and right upper arm support portions and the lower arm support portion are mainly divided into two vertically divided structures. It is characterized by that.

  According to a second aspect of the present invention, the lower frame component includes the upper beam portion (for example, the upper beam portion 43a in the embodiment) having the left and right upper arm support portions and extending in the front-rear direction, and the left and right lower arm support portions. And a lower beam portion extending forward and backward (for example, the lower beam portion 43b of the embodiment).

  The invention described in claim 3 includes the upper beam portion and the lower beam portion, and the upper and lower beam portions are partially coupled via columnar portions (for example, the front and rear columnar portions 43c and 43d in the embodiment). It is characterized by.

  The invention described in claim 4 is characterized in that an engine support portion (for example, the front engine support portion 49c of the embodiment) is provided in the frame structure.

  The invention described in claim 5 is characterized in that a steering support portion (for example, the lower steering support portion 59 of the embodiment) is provided in the frame structure.

  The invention described in claim 6 is characterized in that a vehicle auxiliary equipment support portion (for example, front upper tank support portion 72a, lower tank support portion 74, lower radiator support portion 78 in the embodiment) is provided in the frame structure. To do.

  According to the first aspect of the present invention, by providing the upper frame component having the cushion upper end support portion spaced upward from the lower frame component having the left and right upper arm support portions and the lower arm support portion separately, The number of frame components can be reduced, and the size of the components can be reduced. In addition, the left and right cushion upper end support parts are provided on the integrated upper frame components, and the left and right upper arm support parts and the lower arm support parts are provided on the integrated lower frame component parts, thereby facilitating accuracy control between the left and right suspension support parts. This can reduce the number of frame manufacturing steps.

  According to the second and third aspects of the invention, it is possible to reduce the weight while securing the rigidity of the lower frame components.

  According to the invention described in claims 4, 5, and 6, the support structure of each component can be simplified.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle unless otherwise specified. In the figure, the arrow FR indicates the front of the vehicle, the arrow LH indicates the left side of the vehicle, and the arrow UP indicates the upper side of the vehicle.

A saddle-ride type vehicle 1 shown in FIG. 1 includes a pair of left and right front wheels 2 and rear wheels 3 that are relatively large-diameter low-pressure balloon tires in front of and behind a small and lightweight vehicle body, and ensures a large minimum ground clearance. This is a so-called ATV (All Terrain Vehicle) that has improved running ability on rough terrain.
The vehicle body frame 4 of the saddle-ride type vehicle 1 is formed by integrally bonding a plurality of types of aluminum alloy materials by welding or the like, and forms a box structure that is long in the front-rear direction at the front portion of the left and right central portion of the vehicle body (FIG. 2, FIG. 2). 3). A front end portion of the seat frame 4a extending in the front-rear direction is integrally coupled to the upper rear end portion of the vehicle body frame 4 by bolt fastening or the like.

  A double wishbone type (independent suspension type) front suspension 5 is supported at the front of the vehicle body frame 4, and the left and right front wheels 2 are suspended from the front of the vehicle body via the front suspension 5. The front suspension 5 includes a pair of left and right upper arms 6 and a lower arm 7 that are coupled to the left and right sides of the lower front side of the vehicle body frame 4 so as to swing up and down, and left and right supported by the distal ends of the upper arm 6 and the lower arm 7. A pair of knuckles 8 and a pair of left and right front cushions 9 interposed between the upper arm 6 (or lower arm 7) and the vehicle body frame 4 are mainly used. The left and right front wheels 2 are pivotally supported on the left and right knuckles 8, respectively.

  On the other hand, a swing arm type (axle suspension type) rear suspension 11 is supported at the rear part of the vehicle body frame 4, and the left and right rear wheels 3 are suspended from the rear part of the vehicle body via the rear suspension 11. The rear suspension 11 includes a swing arm 12 whose base end portion is connected to the lower rear end portion of the vehicle body frame 4 so as to be vertically swingable, a rear wheel axle 13 supported by the rear end portion of the swing arm 12, and a swing arm. 12 and a single rear cushion 14 interposed between the vehicle body frame 4 and the like. Left and right rear wheels 3 are pivotally supported on both sides of the rear wheel axle 13.

  An engine 15 as a prime mover of the saddle riding type vehicle 1 is mounted inside the rear part of the body frame 4. The engine 15 is a water-cooled single-cylinder engine having a crankshaft extending in the vehicle width direction (left-right direction), and a cylinder 17A is erected substantially vertically on a crankcase 16 constituting the lower part thereof. In the figure, reference numeral 17 denotes a cylinder head. A drive sprocket 18a is disposed on the left side of the rear portion of the crankcase 16, and an endless drive chain 18c is wound around the drive sprocket 18a and a driven sprocket 18b at the intermediate portion of the rear wheel axle 13.

  A steering shaft 21 that is inclined so that the upper part is located on the rear side is disposed in the left and right central part of the front part of the vehicle body frame 4. A bar-type steering handle 22 is integrally attached to the upper end portion of the steering shaft 21, and a pitman arm 23 of the steering mechanism is integrally attached to the lower end portion of the steering shaft 21. The pitman arm 23 extends rearward from the lower end portion of the steering shaft 21, the proximal end portion of the left and right tie rods 24 is connected to the distal end portion thereof, and the distal end portion of the left and right tie rods 24 is connected to the left and right knuckle 8.

  In the figure, reference numeral 25 denotes a fuel tank disposed on the left side of the front and rear intermediate part of the vehicle body frame 4, reference numeral 26 denotes a radiator disposed on the right side of the front and rear intermediate part of the vehicle body frame 4, and reference numerals 27a and 27b denote engine intake air. The reference numeral 28a and 28b denote the exhaust pipe and silencer of the engine exhaust system, the reference numerals 29a and 29b denote the front fender and the rear fender that cover the upper outer periphery of the front wheel 2 and the rear wheel 3, and the reference numeral 31 denotes the above-described throttle body and air cleaner case. The saddle riding seat supported on the seat frame 4 a is accommodated in the vehicle body cover 32, 32 is a vehicle body cover mainly covering the front upper side of the vehicle body, and 33 a and 33 b are accommodated in the vehicle body cover 32 between the saddle riding seat 31 and the steering shaft 21. The reference numeral 34 designates the lower end portion of the rear cushion 14 and the swing arm 12 and the various electric parts. A link mechanism connecting the vehicle body frame 4, reference numeral 35 denotes a right step for occupant.

  2 and 3, the vehicle body frame 4 includes a front frame assembly 41 having a front suspension support portion 41A, a center frame assembly 51 having a rear suspension support portion 51A, a front frame assembly 41, and a center frame assembly 51. And a pair of upper and lower connecting pipes 61 and 62 for connecting the left and right.

  The front frame assembly 41 includes an upper front frame 42 having a pair of left and right cushion upper end support portions 45 in the front suspension support portion 41A, and a pair of left and right front and rear upper arm support portions 46a and 46b and front and rear lower arm support portions 47a in the front suspension support portion 41A. , 47b and a lower front frame 43 (see FIG. 4). A pair of left and right gusset pipes 44 are provided between the rear portions of the upper and lower front frames 42 and 43.

  On the other hand, the center frame assembly 51 includes a pair of left and right center frames 52 having a pair of left and right swing arm pivot portions 55 in the rear suspension support portion 51A, and a cushion upper end support portion 56 or a link mechanism support portion 57 in the rear suspension support portion 51A. The upper and lower cross members 53 and 54 are provided.

  Further, the left and right upper connecting pipe 61 extends between both sides of the upper end portion of the front frame assembly 41 (both upper end portions of the upper front frame 42) and both sides of the upper end portion of the center frame assembly 51 (upper end portions of the left and right center frames 52). The front end is welded to the front frame assembly 41, and the rear end is welded to the center frame assembly 51. A single top pipe 63 in the upper steering support portion 64 is provided between the front portions of the left and right upper connection pipes 61.

  The left and right lower connecting pipes 62 are formed between both sides of the rear end of the lower portion of the front frame assembly 41 (both sides of the rear end of the lower front frame 43) and both sides of the lower end of the center frame assembly 51 (lower ends of the left and right center frames 52). The front end extends to the front frame assembly 41 and the rear end to the center frame assembly 51 by welding.

Here, the upper and lower front frames 42 and 43 are integrally cast aluminum parts, and the left and right center frame 52 and the upper and lower cross members 53 and 54 are integrally forged aluminum parts. The upper and lower front frames 42 and 43 may be integrated aluminum forged parts, and the left and right center frames 52 and the upper and lower cross members 53 and 54 may be aluminum cast parts. Further, all of the upper and lower front frames 42 and 43, the left and right center frame 52, and the upper and lower cross members 53 and 54 may be integrated aluminum casting parts or forging parts, respectively.
On the other hand, each of the connecting pipes 61 and 62, the top pipe 63, and the gusset pipe 44 is a part formed by bending a single aluminum extruded material. A part or all of each of the connecting pipes 61 and 62, the top pipe 63, and the gusset pipe 44 may be an integral aluminum cast part or forged part.

  Referring also to FIG. 4, the upper front frame 42 has an upper side portion 42 a extending left and right and left and right side portions 42 b extending downward from both ends thereof, and is formed in an inverted triangular shape in front view. The upper front frame 42 is arranged in parallel with the left-right direction, and is inclined so that the upper part is located on the rear side in a side view. On both sides of the upper end portion of the upper front frame 42, the cushion upper end support portions 45 projecting outward in the left and right directions are integrally formed. The left and right cushion upper end support portions 45 form front and rear walls that are parallel to each other. The upper end portion of the front cushion 9 enters between the front and rear walls, and the upper end portion is swingably connected via a connecting shaft that is inclined slightly rearwardly downward. Is done.

  On both sides of the upper rear portion of the upper front frame 42, an upper extending portion 42c extending obliquely upward and rearward and a lower extending portion 42d extending obliquely downward and rearward below are integrally formed. The front end of the upper connection pipe 61 is welded to the tip of the left and right upper extension 42c, and the upper end of the gusset pipe 44 is welded to the tip of the left and right lower extension 42d.

  The lower front frame 43 includes upper and lower beam portions 43a and 43b extending in the front-rear direction, and front and rear columnar portions 43c and 43d that integrally couple the upper and lower beam portions 43a and 43b between the front end portions and between the front and rear intermediate portions. Have. The upper and lower beam portions 43a and 43b are respectively arranged so as to incline backward and downward, the upper beam portion 43a is provided in a curved shape convex upward in a side view, and the lower beam portion 43b is provided in a straight shape in a side view. It is done.

  The front half portions of the upper and lower beam portions 43a and 43b are disposed substantially parallel to each other, while the rear half portion of the upper beam portion 43a is inclined rearward and the rear end portion thereof is an acute angle in a side view above the rear end portion of the lower beam portion 43b. Merge into and integrate. The front and rear intermediate portions of the lower front frame 43 that are long in the front-rear direction are integrated by connecting the front end portions and the front and rear intermediate portions of the upper and lower beam portions 43a and 43b via the front and rear columnar portions 43c and 43d. The front and rear space portions K1, K2 penetrating the lower front frame 43 to the left and right are formed between the front half and the rear half of the upper and lower beam portions 43a, 43b. In the figure, reference numeral 48 denotes a support portion for a carry pipe (not shown).

  The upper and lower beam portions 43a and 43b extend in the front-rear direction in a flat shape having a wider left-right width than the upper-lower thickness. Further, the front and rear columnar portions 43c and 43d extend in the vertical direction with a flat shape having a width that is wider than the front and rear thickness. The upper and lower end portions of the front and rear columnar portions 43c and 43d increase in the front and rear thickness toward the distal end side, thereby suppressing the stress concentration at the joint portion with the upper and lower beam portions 43a and 43b. Further, the left and right widths of the lower front frame 43 are provided to be slightly wider toward the rear side.

  The front and rear upper arm support portions 46a and 46b are integrally formed on both sides of the front end portion of the upper beam portion 43a and on both sides of the front and rear intermediate portion. Each of the upper arm support portions 46a and 46b has a cylindrical shape that is inclined slightly rearward and is provided coaxially with each other. These upper arm support portions 46a and 46b are respectively mounted with U-shaped front and rear connecting portions 6a and 6b at the base end portion of the upper arm 6, and the front and rear connecting portions 6a and 6b are inclined slightly rearwardly. Each is pivotably connected via a shaft.

  The front and rear lower arm support portions 47a and 47b projecting outward in the left and right directions are integrally provided on both sides of the front end portion and the front and rear intermediate portions of the lower beam portion 43b. Each of the lower arm support portions 47a and 47b is inclined slightly rearward and has a cylindrical shape coaxial with each other. The lower arm support portions 47a and 47b are connected to each other in the shape of a U in the top view on the base end side of the lower arm 7 respectively. The parts 7a and 7b are mounted, and the front and rear connecting parts 7a and 7b are connected so as to be swingable via a connecting shaft inclined slightly rearwardly downward.

  Note that the lower end portion of the front cushion 9 is connected to the upper arm 6 (or the lower arm 7) so as to be swingable via a connecting shaft inclined slightly rearwardly downward. The connecting shafts at the upper and lower ends of the front cushion 9 and the connecting shafts at the base ends of the upper arm 6 and the lower arm 7 are parallel to each other.

  A front pedestal portion 49a protruding upward is integrally provided on the upper side of the front end portion of the upper beam portion 43a, and the lower end portion of the upper front frame 42 is welded to the front pedestal portion 49a. Further, a rear pedestal portion 49b that protrudes upward is formed on the upper side of the front and rear intermediate portion of the upper beam portion 43a.

  The left and right gusset pipes 44 are made of straight square members, and are inclined so that the upper part is located on the front side in a side view, and are inclined so that the upper part is located on the left and right outside in a front view. These left and right gusset pipes 44 are provided between the left and right lower extending portions 42 d of the upper front frame 42 and both sides of the rear pedestal portion 49 b of the lower front frame 43. The left and right widths of the front part of the body frame 4 are provided so as to increase toward the upper side.

At this time, the front half portions of the gusset pipe 44, the upper front frame 42, and the upper beam portion 43a are arranged in a substantially equilateral triangle shape in a side view, and an upper space portion that penetrates the front frame assembly 41 to the left and right inside thereof. K3 is formed. As a result, the rigidity of the upper portion of the front frame assembly 41 is increased and the weight is reduced.
Further, the upper front frame 42 and the front columnar portion 43c are linearly connected in a side view, and the gusset pipe 44 and the rear columnar portion 43d are linearly connected in a side view, so that the front frame assembly 41 that is long in the vertical direction is formed. A crossing portion between the front portion and the lower portion of the front frame assembly 41 (lower front frame 43) long in the front-rear direction is firmly provided.

  A front engine support portion 49c that forms a trapezoidal shape in a side view and projects obliquely upward and rearward is integrally formed on the upper rear end portion of the upper beam portion 43a. A base end portion of a pair of left and right front engine support plates 49d is coupled to the left and right sides of the front engine support portion 49c by bolt fastening or the like, and a front end portion of the front engine support plate 49d is above the front end portion of the crankcase 16 of the engine 15. Are coupled by bolt fastening or the like. That is, the upper front end portion of the crankcase 16 of the engine 15 is supported by the front engine support portion 49c of the lower front frame 43 via the left and right front engine support plates 49d.

  In addition to the upper side of the front end portion of the crankcase 16, the engine 15 is supported by the front side of the left and right lower connecting pipe 62 via the engine support bracket 62a, and the rear portion of the cylinder head 17 is It is supported on the upper part of the left and right center frame 52 via the rear engine support plate 52d, and the rear end part of the crankcase 16 is supported on the swing arm pivot part 55 below the left and right center frame 52 via the pivot shaft 55a (FIG. 1). reference).

  The left and right center frames 52 extend vertically in the rear portion of the vehicle body front-rear intermediate portion, and are provided symmetrically with respect to each other. The rear end portion of the upper connecting pipe 61 is welded to the front side of the upper end portion of the left and right center frame 52. Further, a member support portion 58 projecting rearward is integrally formed on the rear side of the upper end portion of the left and right center frames 52, and the end portion of the upper cross member 53 is welded to the left and right inner sides of the member support portion 58. The cushion upper end support portion 56 protruding rearward is integrally formed on the rear side of the left and right intermediate portions of the upper cross member 53.

  The lower end portion of the left and right center frame 52 is curved forward and extends, and the rear end portion of the lower connecting pipe 62 is welded to the front end portion thereof. Further, the end of the lower cross member 54 is welded to the left and right inner sides of the lower end of the left and right center frame 52. On the rear side of the left and right intermediate portions of the lower cross member 54, the link mechanism support portion 57 protruding rearward is integrally formed. A step support portion 52a for supporting the step 35 is provided on the left and right outer sides of the lower end portion of the left and right center frame 52, and a seat frame for supporting the front end portion of the seat frame 4a on the upper rear side of the left and right center frame 52. A support portion 52b is provided, and a rear engine support portion 52c that supports the engine 15 via a rear engine support plate 52d is provided on the upper front side of the left and right center frames 52.

The swing arm pivot portion 55 is provided at the lower portion of the left and right center frame 52, and the front end portion of the swing arm 12 is supported on the swing arm pivot portion 55 so as to be swingable up and down via the pivot shaft 55a along the left and right direction. Is done.
The center frame assembly 51 is formed in a rear-view trapezoidal shape with a slightly narrower left and right width on the upper side. Further, the left and right lower connecting pipes 62 are inclined so as to be separated from each other as viewed from the top, and are provided so as to be substantially horizontal when viewed from the side. Further, the left and right upper connection pipe 61 is provided so as to be substantially along the front-rear direction in a top view, and is bent so that the front part is inclined rearward and the rear part is substantially horizontal in a side view.

  The top pipe 63 is curved in an upwardly convex mountain shape when viewed from the front, and the left and right intermediate portions protrude upward from the upper connecting pipe 61. Left and right bosses 63a project from the front side of the left and right intermediate part of the top pipe 63, and a front / rear split body 63b is attached to the left and right bosses 63a by bolt fastening. The upper outer peripheral surface of the steering shaft 21 is rotatably supported on the cylindrical inner peripheral surface formed by the front / rear split body 63b. That is, an upper steering support portion 64 that mainly supports the top pipe 63, the left and right bosses 63a, and the front / rear split body 63b so that the upper portion of the steering shaft 21 is rotatable is configured. In addition, the code | symbol 63c in the figure shows the right and left gusset plate straddling between the rear part of the top pipe 63, and the upper connection pipe 61 upper part.

  A lower steering support portion 65 that rotatably supports the lower end portion of the steering shaft 21 is provided in the front half of the lower beam portion 43b. The lower steering support portion 65 forms a shaft insertion hole 65a that vertically penetrates the lower beam portion 43b, and supports the lower end portion of the steering shaft 21 in the shaft insertion hole 65a so as to be rotatable. A lower end portion of the steering shaft 21 projects below the lower steering support portion 65 (in the front space K1), and a pitman arm 23 of the steering mechanism is attached to the lower end portion. That is, the front space K1 is also a space for arranging the steering mechanism. Reference numeral 65b in the drawing is provided below the lower beam portion 43b so as to abut against the pitman arm 23 when the steering shaft 21 is rotated and the maximum rotation angle of the steering shaft 21 (the maximum steering angle of the steering handle 22). ) Shows the handle stopper.

  As shown in FIGS. 5 and 6, the fuel tank 25 is provided so as to be surrounded by the rear half of the lower beam portion 43 b, the gusset pipe 44, and the front half of the upper connection pipe 61 in a side view. The fuel tank 25 is arranged offset from the center of the vehicle body so that the entire fuel tank 25 is located on the left side of the vehicle body when viewed from above, and the left side of the fuel tank 25 is on the left side of the upper left connecting pipe 61 (the left and right outside of the vehicle body frame 4). It is provided to project. In the figure, reference numeral 25a denotes a fuel cap that is attached to the fuel inlet at the upper end of the rear portion of the fuel tank 25, and reference numeral 25b denotes a fuel pump that is attached to the opening at the upper end of the front portion of the fuel tank 25 to Each supporting pump holder is shown.

  The upper surface of the front portion of the fuel tank 25 is formed in a flat shape with a front lowering, and a metallic upper tank support bracket 71 that is curved so as to go around from the front side of the tank holder 25b to the left side is attached to the upper surface. Plate-like front and rear support flanges 71a and 71b orthogonal to the left and right direction are erected on the front and rear of the upper tank support bracket 71, and the front and rear upper tank support portions 72a and 72b corresponding to the front and rear support flanges 71a and 71b are the upper front frame. 42 on the rear side of the upper left end portion of 42 and the lower side of the front portion of the upper connecting pipe 61. The front and rear upper tank support portions 72a and 72b form boss portions extending in the left-right direction, and the front and rear support flanges 71a and 71b are arranged on the left and right inner sides or the outer sides of the boss portions, and these are fastened with bolts via rubber bushes or the like. Thus, the upper portion of the fuel tank 25 is elastically supported by the front frame assembly 41 and the upper left connecting pipe 61, respectively.

  On the other hand, a tank support leg 73 is provided at the lower end of the fuel tank 25 along the upper surface of the lower half part of the lower beam part 43b. The tank support 74 is recessed, and the tank support leg 73 is fitted to the lower tank support 74 via a rubber damper or the like, so that the lower portion of the fuel tank 25 is elastically supported by the front frame assembly 41.

  Referring also to FIG. 7, the radiator 26 has a plate shape extending in the left-right direction, is inclined slightly forward from the upright state, and is provided so as to overlap the fuel tank 25 in a side view. The radiator 26 is disposed so as to be offset from the center of the vehicle body so as to be located on the right side of the vehicle body in a top view, and the right side portion thereof protrudes to the right side (the left and right outside of the vehicle body frame 4) from the upper right connection pipe 61. Provided. In the figure, reference numeral 26a denotes a radiator fan mounted on the rear surface side of the radiator 26, reference numeral 26b denotes a resinous radiator grill disposed in front of the radiator 26, and reference numeral 26c denotes a left front of the cylinder 17A of the engine 15. Each of the thermostats shown in FIG.

  On the rear surface of the upper tank of the radiator 26, an upper radiator support bracket 75 that is bent in an L shape when viewed from above is attached. The upper radiator support bracket 75 forms a support flange 75 a orthogonal to the left-right direction, and an upper radiator support portion 76 corresponding to the support flange 75 a is provided below the front portion of the upper right connecting pipe 61. The upper radiator support portion 76 forms a boss portion extending in the left-right direction, and a support flange 75a is disposed on the left and right outer sides of the boss portion, and these are fastened with bolts via a rubber bush or the like, so that the upper portion of the radiator 26 is The connection pipe 61 is elastically supported.

  On the other hand, on the lower surface of the lower tank of the radiator 26, for example, a pair of engaging portions 77 having a rod shape are provided, and a lower radiator support bracket 77a corresponding to the engaging portion 77 is provided on the right side of the rear half of the lower beam portion 43b. It is attached to the provided lower radiator support portion 78. The lower radiator support bracket 77a extends rightward from the lower radiator support portion 78, and the engaging portion 77 engages with the extended portion of the lower radiator support bracket 77a via a rubber bush or the like, thereby lowering the lower portion of the radiator 26. Is elastically supported by the front frame assembly 41.

  The radiator grille 26b is disposed in a forward tilting posture with a slight inclination compared to the radiator 26, and an upper end portion of the radiator grille 26b is disposed on an upper grille support portion 79a provided on the rear side of the upper right end portion of the upper front frame 42. The portion is supported by the front frame assembly 41 by engaging with the lower grille support portion 79b provided on the upper right side of the rear half of the upper beam portion 43a.

  As described above, the vehicle body frame structure in the above embodiment is applied to the saddle-ride type vehicle 1 having a pair of left and right front wheels 2, and the front suspension support portion 41A for suspension of the left and right front wheels 2 is provided. The front suspension assembly 41A includes a pair of left and right cushion upper end support portions 45, a pair of left and right upper arm support portions 46a and 46b, and lower arm support portions 47a and 47b. However, the upper front frame 42 having the left and right cushion upper end support portions 45 and the lower front frame 43 having the left and right upper arm support portions 46a and 46b and the lower arm support portions 47a and 47b are mainly divided into upper and lower parts. It is.

  According to this configuration, the upper front frame 42 having the left and right cushion upper end support portions 45 spaced apart upward is provided separately from the lower front frame 43 having the left and right upper arm support portions 46a and 46b and the lower arm support portions 47a and 47b. As a result, the number of frame components can be reduced, and the size of the components can be reduced. Further, the left and right cushion upper end support portions 45 are provided on the integrated upper front frame 42, and the left and right upper arm support portions 46a and 46b and the lower arm support portions 47a and 47b are provided on the integrated lower front frame 43, whereby the front suspension support portion 41A. It is possible to easily manage the accuracy between the left and right sides, and to reduce the number of frame manufacturing steps.

  In the vehicle body frame structure, the lower front frame 43 includes the left and right upper arm support portions 46a and 46b and extends in the front-rear direction and the left and right lower arm support portions 47a and 47b. The lower beam portion 43b extending to the upper and lower beam portions 43a and 43b are partially coupled via the front and rear columnar portions 43c and 43d, thereby reducing the weight of the lower front frame 43 while ensuring the rigidity. Can be planned.

  Further, in the vehicle body frame structure, the front frame assembly 41 is provided with a front engine support portion 49c, a lower steering support portion 65, a front upper tank support portion 72a, a lower tank support portion 74, and a lower radiator support portion 78. The support structure for each component can be simplified.

The present invention is not limited to the above embodiment, and may be a front frame assembly 141 shown in FIGS. In the following, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The front frame assembly 141 is different from the front frame assembly 41 mainly in that it includes a lower front frame 143 that replaces the lower front frame 43. Further, the lower front frame 143 is an integral aluminum cast part (or aluminum cast part), and is mainly different from the lower front frame 43 in that it has an upper beam part 143a instead of the upper beam part 43a.
The rear half of the upper beam portion 143a has a downwardly convex curved shape in side view, the latter half is integrated with the rear half of the lower beam portion 43b, and the rear space K2 is eliminated. In the figure, reference numeral 149c denotes a front engine support part that supports the front part of the engine 15 via an engine support plate (not shown), and reference numeral 174 denotes a lower tank support part that supports the lower part of the fuel tank (not shown). .

In addition, a portion corresponding to the gusset pipe 44 may be integrally formed with the upper front frame 42a. Moreover, you may apply to the vehicle body frame which consists of metal materials other than an aluminum alloy.
Further, the left and right rear wheels 3 are suspended by independent suspension type rear suspensions, and rear suspension support parts (left and right cushion upper end support parts and left and right upper and lower arm support parts) for left and right rear wheel suspensions are provided at the rear part of the vehicle body frame. In the configuration including the frame structure, a divided structure similar to the front frame assembly 41 may be applied to the rear portion of the frame structure, that is, the vehicle body frame.
And the structure in the said Example is an example of this invention, Of course, it can apply also to the vehicle of the number of wheels more than three-wheels or four-wheels, and a vehicle (scooter type vehicle etc.) which are not saddle riding type | molds, The summary of the said invention It goes without saying that various changes can be made without departing from the scope.

1 is a left side view of a saddle-ride type vehicle in an embodiment of the present invention. It is the perspective view which looked at the body frame of the saddle-ride type vehicle from the upper left front. It is the perspective view which looked at the above-mentioned body frame from the upper left back. It is a disassembled perspective view of the front frame assembly of the said vehicle body frame. It is a left view of the vehicle body front part of the saddle riding type vehicle. It is a top view of the principal part structure of the vehicle body front part of the said saddle riding type vehicle. It is a right view of the principal part structure of the vehicle body front part of the said saddle-ride type vehicle. It is a left view which shows the modification of the said front frame assembly. It is the perspective view which looked at the front frame assembly shown in FIG. 8 from the upper left front.

Explanation of symbols

1 saddle riding type vehicle (vehicle)
2 Front wheels
41,141 Front frame assembly (frame structure)
41A Front suspension support (suspension support)
42 Upper front frame (upper frame components)
43,143 Lower front frame (lower frame components)
43a, 143a Upper beam portion 43b Lower beam portion 43c, 43d Front and rear columnar portions (columnar portions)
45 Cushion upper end support part 46a, 46b Front and rear upper arm support part (upper arm support part)
47a, 47b Front / rear lower arm support (lower arm support)
49c, 149c Front engine support (engine support)
65 Lower steering support (steering support)
72a Front upper tank support part (vehicle auxiliary equipment support part)
74,174 Lower tank support part (vehicle auxiliary equipment support part)
78 Lower radiator support (vehicle accessory support)

Claims (6)

A vehicle body frame structure with a pair of left and right wheels,
In a vehicle body frame structure comprising a frame structure having suspension support portions for suspension of the left and right wheels, wherein the suspension support portion comprises a pair of left and right cushion upper end support portions, a pair of left and right upper arm support portions, and a lower arm support portion.
The frame structure is mainly composed of an upper frame component having the left and right cushion upper end support portions and a lower frame component having the left and right upper arm support portions and a lower arm support portion, which are mainly divided into upper and lower parts. Car body frame structure. 2. The lower frame component includes an upper beam portion having the left and right upper arm support portions and extending in the front-rear direction, and a lower beam portion having the left and right lower arm support portions and extending in the front-rear direction. Body frame structure as described in 1. The vehicle body frame structure according to claim 2, further comprising an upper beam portion and a lower beam portion, wherein the upper and lower beam portions are partially coupled via a columnar portion. The vehicle body frame structure according to any one of claims 1 to 3, wherein an engine support portion is provided in the frame structure body. The vehicle body frame structure according to any one of claims 1 to 4, wherein a steering support portion is provided on the frame structure. The vehicle body frame structure according to any one of claims 1 to 5, wherein a vehicle accessory support portion is provided in the frame structure.

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